Constraining magnetization of gamma-ray bursts outflows using prompt emission fluence

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dc.contributor.author Pe'er, Asaf
dc.date.accessioned 2018-09-24T12:36:58Z
dc.date.available 2018-09-24T12:36:58Z
dc.date.issued 2017
dc.identifier.citation Asaf, P. (2017) 'Constraining magnetization of gamma-ray bursts outflows using prompt emission fluence', Astrophysical Journal, 850(2), 200 (8pp). doi: 10.3847/1538-4357/aa974e en
dc.identifier.volume 850
dc.identifier.issued 2
dc.identifier.startpage 1
dc.identifier.endpage 8
dc.identifier.issn 0004-637X
dc.identifier.uri http://hdl.handle.net/10468/6877
dc.identifier.doi 10.3847/1538-4357/aa974e
dc.description.abstract Considered here is the acceleration and heating of relativistic outflow by local magnetic energy dissipation process in Poynting-flux dominated outflow. Adopting the standard assumption that the reconnection rate scales with the Alfven speed, I show here that the fraction of energy dissipated as thermal photons cannot exceed (13 (gamma) over cap -14)(-1) = 30% (for adiabatic index (gamma) over cap = 4/3) of the kinetic energy at the photosphere. Even in the most radiatively efficient scenario, the energy released as non-thermal photons during the prompt phase is at most equal to the kinetic energy of the outflow. These results imply that calorimetry of the kinetic energy that can be done during the afterglow phase could be used to constrain the magnetization of gamma-ray bursts (GRB) outflows. I discuss the recent observational status and its implications on constraining the magnetization in GRB outflows. en
dc.description.sponsorship National Aeronautics and Space Administration (NNX12AO83G). en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher IOP Publishing Ltd en
dc.relation.uri http://iopscience.iop.org/article/10.3847/1538-4357/aa974e/meta
dc.rights © 2017, The American Astronomical Society. All rights reserved. en
dc.subject Stars en
dc.subject Gamma-ray burst en
dc.subject General en
dc.subject Magnetic reconnection en
dc.subject Magnetohydrodynamics (MHD en
dc.subject Plasmas en
dc.subject Radiation mechanisms en
dc.subject Non-thermal en
dc.subject Radiation mechanisms en
dc.subject Thermal en
dc.title Constraining magnetization of gamma-ray bursts outflows using prompt emission fluence en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Asaf Pe’er, Physics, University College Cork, Cork, Ireland. +353-21-490-3000 Email: a.peer@ucc.ie en
dc.internal.availability Full text available en
dc.description.version Published Version en
dc.contributor.funder Seventh Framework Programme
dc.contributor.funder National Aeronautics and Space Administration
dc.description.status Peer reviewed en
dc.identifier.journaltitle Astrophysical Journal en
dc.internal.IRISemailaddress a.peer@ucc.ie en
dc.identifier.articleid 200
dc.relation.project info:eu-repo/grantAgreement/EC/FP7::SP3::PEOPLE/618499/EU/Transient-Sky/TRANSIENT-SKY


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